Heavy rain and thunderstorms were forecast for the mountain and desert areas Monday night, and a flash flood warning issued on Sunday remained in effect through the evening, according to the National Weather Service.

The rainfall is expected to cause more flooding as well as mud and debris flow in burn areas, the agency said. It warned residents to have a plan of action in case of flash floods and to be ready to shelter in place or to move to higher ground.

Anyone who needs information about their properties in Borrego can call the Borrego sheriff’s station at (760) 767-5656.